Air purifier



FIG. 1 is a perspective view of an air purifier according to our design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 bottom plan view thereof.

The dashed lines immediately adjacent to the oblong border of the innercentral surface of the rear of the unit, shown in FIG. 3, and thevertical dashed lines on the outer edges of the inset areas on eitherside of the inner central surface of the rear of the unit, shown inFIGS. 3-4, represent the boundaries of the claimed design. The remainingdashed lines in the figures illustrate the portions of the design thatform no part of the claimed design. None of the broken lines form anypart of the claimed design.

The ornamental design for a air purifier, as shown and described.